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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

HELLEN MAI NGUYEN DO
NPI 1134810724
Family Medicine in Pomona, CA

Active since May 16, 2023
309 E 2ND ST, POMONA, CA 91766(909) 469-5589 Get Directions Write a Review

NPPES record last updated: June 18, 2026. Verified against the NPPES registry weekly; last sync: August 02, 2026.

Record update history: Apr 8, 2026, May 16, 2023 (2 updates tracked since 2023).

About Hellen Mai Nguyen Do NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

HELLEN MAI NGUYEN DO (NPI 1134810724) is an individual family medicine provider in Pomona, California, licensed in Washington (OL70114003) and active in the NPI registry since May 2023. She maintains a secondary practice location in Yakima.

NPPES Registry Identity

NPI1134810724
Entity TypeIndividualFemale
Primary Taxonomy207Q00000X
Provider Legal NameHELLEN MAI NGUYENCredential: DO
Location Address309 E 2ND STPomona, CA 91766-1854
Mailing Address501 S 5th AveYakima, WA 98902-3550 · (509) 853-1082 · Fax (509) 573-6275
Phone(909) 469-5589
Sole ProprietorNo
Enumeration DateMay 16, 2023
Last NPPES UpdateJune 18, 20262 updates tracked since enumeration
NPPES CertifiedJune 18, 2026
✔ NPI 1134810724 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyFamily MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207Q00000X
License✔ Licensed in WA · OL70114003
Definition
Family Medicine is the medical specialty which is concerned with the total health care of the individual and the family. It is the specialty in breadth which integrates the biological, clinical, and behavioral sciences. The scope of family medicine is not limited by age, sex, organ system, or disease entity.
Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X · License OL70114003 (WA)
309 E 2ND ST, Pomona, CA 91766
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Secondary Practice Location 1

Location 11806 W Lincoln AveYakima, WA 98902-2473 · Phone (509) 452-4520 · Fax (509) 452-5224

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

NANCY IRENE NIELSEN-BROWN PA-C
Physician Assistant (Medical)
309 E 2ND ST
POMONA, CA 91766
Los Angeles County (909) 469-5386
BRITTNEY TUNON
Physician Assistant
309 E 2ND ST
POMONA, CA 91766
Los Angeles County (703) 955-6286
MR. EVAN HERSHMAN
Student in an Organized Health Care Education/Training Program
309 E 2ND ST
POMONA, CA 91766
Los Angeles County (909) 469-5589
CHAU MINH NGUYEN PA-C
Physician Assistant
309 E 2ND ST
POMONA, CA 91766
Los Angeles County (951) 892-4858
AMI PATEL
Student in an Organized Health Care Education/Training Program
309 E 2ND ST
POMONA, CA 91766
Los Angeles County (909) 469-5589
MR. FOUAD HAJJAR
Student in an Organized Health Care Education/Training Program
309 E 2ND ST
POMONA, CA 91766
Los Angeles County (909) 469-5589
THAO BICH VU
Student in an Organized Health Care Education/Training Program
309 E 2ND ST
POMONA, CA 91766
Los Angeles County (909) 469-5589
JULIA B DIAMANT
Student in an Organized Health Care Education/Training Program
309 E 2ND ST
POMONA, CA 91766
Los Angeles County (909) 469-5589

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Hellen Nguyen's NPI number?

The NPI number for Hellen Nguyen is 1134810724. It was assigned to this individual provider in the NPPES registry on May 16, 2023.

Where is Hellen Nguyen located?

Hellen Nguyen practices at 309 E 2nd St, Pomona, CA 91766. The listed phone number is (909) 469-5589.

What is Hellen Nguyen's specialty?

The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.

When was this NPI record last updated?

The NPPES record for Hellen Nguyen was last updated on June 18, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 51 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.